B. Papp szerk.: Studia Botanica Hungarica 30-31. 1999-2000 (Budapest, 2000)

Rákosi, László; Barbacka, Mária: Upper Cretaceous flora from Ajka (W Hungary). I. Thallophyta

Dijkstra 1949 showed Mycophyta characteristics and it was probably a fossil conidiophore. An important sample was found in the borehole Kf-2, from 789.6 m. The large number of Costatheca discoënsis was arranged massula-like in four rows around a central body (Figs 30-31). At the circumference of this structure the coalified envelope remains were observed. The relationship of the genus Costatheca is not clear up to now. MINER (1935) classified it to Jungermanniales and considered it as a remain of a perianth. KNOBLOCH (1981, 1986) suggested its relationship with Angiospermae.' It appears that no reference to this type of structure was made to date. In our opinion, on the basis of the observations available so far, the Costatheca may be a reproductive organ of an unknown and undescribed fossil Algae. 26 27 Figs 26-29. Lobasporites lobatus, borehole Kf-2, bars = 200 um (Figs 26-27), 30 urn (Fig. 28), 5 urn (Fig. 29).